1. Natural Drug Discovery Laboratory, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
2. Department of Surgery and Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama 930-0194, Japan
3. Department of Gastroenterological Surgery, Nagoya University Graduate School of Medicine, Nagoya 466-8560, Japan
4. Faculty of Engineering, University of Toyama, Toyama 930-8555, Japan
5. Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan